Running WPS to work with WRF (weather forecasting System )

I am running WPS, to work with WRF(Weather Forecasting Model), but I find a problem in running WPS, which is:

At line 143 of file gridinfo_module.f90 (unit = 10, file = 'namelist.wps') Fortran runtime error: Invalid string input in item 14

Error termination. Backtrace:
#0  0x7fd2b51a2ef7 in ???
#1  0x7fd2b51a3a95 in ???
#2  0x7fd2b51a424c in ???
#3  0x7fd2b526988f in ???
#4  0x7fd2b5269d0b in ???
#5  0x7fd2b526bf39 in ???
#6  0x7fd2b527365d in ???
#7  0x7fd2b5273848 in ???
#8  0x404a0b in ???
#9  0x40334c in ???
#10  0x7fd2b4ad482f in ???
#11  0x402428 in ???
#12  0xffffffffffffffff in ???

Is there anyone who knows how to solve this problem, or someone who has already met it? Thank you very much.

**I am following that exists here: http://www2.mmm.ucar.edu/wrf/OnLineTutorial/compilation_tutorial.php

This error means you need to double-check your namelist.wps. Apparently, line 14 is problematic. It could either be a bad key or a bad value it is complaining about. The error message seems to indicate that the value should be a string. It is hard to know what the problem is without seeing your namelist.wps.